vulnerability / NVI-00017834 / Revision 1
pnpm: Unsafe default behavior breaks integrity check
GitHub lists this reviewed advisory for pnpm, pnpm. Published version ranges and source prerequisites are shown below; this is not an inspection of a visitor’s application.
This report has not inspected your inventory, configuration, deployed build, reachability or evidence. A catalog listing and a severity score do not establish exposure or compromise.
01 / Meaning
Why it matters
Published affected context helps an owner decide what evidence to gather. This report has not examined your application.
6.8 medium
GitHub source severity; exploitability and local consequence require separate evidence.
As of · GitHub Advisory Database
02 / Applicability
The affected context
Affected versions, configuration prerequisites and known exclusions are public. Confirm each one against the deployed service.
pnpm
source listed< 10.34.0
While it is unclear whether this should be classified as a vulnerability, it is being reported through this channel because the current behavior may represent an unsafe default. ## Summary `pnpm install` in non-frozen mode can accept new remote package content after detecting that the downloaded tarball does not match the integrity recorded in `pnpm-lock.yaml`. When a package is already locked with an `integrity` value, and the registry later serves different metadata and tarball content for the same package name and version, pnpm initially reports an integrity mismatch. However, plain `pnpm install` then performs a resolution repair, accepts the registry's new integrity, updates the lockfile, installs the new content, and exits successfully. This means the lockfile integrity check does not act as a hard stop by default. ## Reproduction Scenario 1. Run a local npm-compatible registry. 2. Publish or serve `example-package@1.0.0` with tarball content `v1`. 3. Install it with pnpm: ```bash pnpm add example-package@1.0.0 --registry=http://127.0.0.1:48741 ``` 4. Confirm `pnpm-lock.yaml` contains the `v1` integrity: ```yaml packages: example-package@1.0.0: resolution:
pnpm
source listed>= 11.0.0, < 11.4.0
While it is unclear whether this should be classified as a vulnerability, it is being reported through this channel because the current behavior may represent an unsafe default. ## Summary `pnpm install` in non-frozen mode can accept new remote package content after detecting that the downloaded tarball does not match the integrity recorded in `pnpm-lock.yaml`. When a package is already locked with an `integrity` value, and the registry later serves different metadata and tarball content for the same package name and version, pnpm initially reports an integrity mismatch. However, plain `pnpm install` then performs a resolution repair, accepts the registry's new integrity, updates the lockfile, installs the new content, and exits successfully. This means the lockfile integrity check does not act as a hard stop by default. ## Reproduction Scenario 1. Run a local npm-compatible registry. 2. Publish or serve `example-package@1.0.0` with tarball content `v1`. 3. Install it with pnpm: ```bash pnpm add example-package@1.0.0 --registry=http://127.0.0.1:48741 ``` 4. Confirm `pnpm-lock.yaml` contains the `v1` integrity: ```yaml packages: example-package@1.0.0: resolution:
03 / Response
What to do next
- investigate
Identify the exact component and deployed version, examine the linked publisher’s conditions, and retain evidence of any mitigation.
Confirm current vendor support, compatibility and deployment evidence. This report has not tested a fix in your system. GitHub Advisory Database
A fixed release is not deployment evidence.
Check current vendor support and compatibility. After making a change, verify the deployed build and relevant runtime conditions. Keep the evidence, owner and time. An updated lockfile alone does not prove what is running.
04 / Limits
What this report cannot establish
- Customer inventory, deployment, reachability and exploitation have not been inspected.
05 / Provenance
Sources you can inspect
Each assertion retains its source. Mirrored records may repeat one underlying publisher; additional links are not independent corroboration.
- GHSA-54hh-g5mx-jqcp ↗
GitHub Advisory Database · vendor advisory
Observed . GitHub Advisory Database; CC-BY-4.0. Each advisory links its original attribution. Null normalizes fields.
Public revision history
Only published revisions appear here. Routine fetches do not create a material-change event.
- Revision 1 ·
First indexed by Null; source disclosure date is shown separately.